[How To] get 100% charge, overnight, lazily.

[vassskk]

Many of you have read byrong's article on actual battery charge.
http://forum.xda-developers.com/showthread.php?t=871051

He discusses the creep down from 100% to 90% overnight; as well as bump charging.

I am offering a solution that will give you 100% (or over 100% if you so choose) every night without any effort after initial setup.

Lets first look at the charger:
Output:
5v
1000 mAh

So every hour, your charger could potentially flow 1000 mA into your battery, right? There's actually two contingencies:
How much can the battery pull, and the roll-off at the peak of the charge.

According to byrong's data, the last 10% charge rate rolls from 650 to 100mah in 45 minutes almost linearly. Prior to this roll-off, we are seeing 650 mAh pull from the battery which appears to be linear.

Ok now we can do our time calculation:

mAh of your battery: A = (1300 for stock)
Charge Rate: CR = (650)
10% roll-off: -(650-100)/(45/60) = -733 mAh/h (approx) Feel free to do the integral .1A/∫(650-733t)dt. Im just going to call it a flat +45 mins.

(A-A*.1)/CR + (45/60) = charge time in hours.

For stock, this is:

(1300 - (.1*1300))/650 + (45/60) = T (h)

T(h) = 2.55 hours. FROM ZERO CHARGE

I normally run down to about 30%. In that case... 1300*.3 = 390 -1300 = 910 mAh to charge
Run the calc again:

(910 - (.1*910))/650 + (45/60) = T (h)

T(h) (30%) = 2.01 Hours
Now what do we do with this?

Say hello to the appliance timer (you can get them at the dollar store):

http://www.amazon.com/50460-24-hour-Multi-Event-Appliance-Timer/dp/B000G1MD80


100% Charge Procedure:
Set ON 2 hours before you normally wake up.
Set OFF sometime prior to when you go to sleep.
You get:
100% charge every morning
If you oversleep, worst case scenario you end up with 90%.


BUMP Charge Procedure:
Set ON 3-4 hours before you normally wake up.
Set OFF 2 hours after that.
Set ON immediately after OFF,
Set OFF .5 hours after,
etc... until you've bumped to your desired level.


From now on just plug your phone in when you go to bed, and wake up to a 10% fresher battery every morning!

If you normally deplete your battery to a point where it will not make it until 2 hours before you wake up, consider setting your first OFF to 30 mins after you normally go to sleep.

ENJOY.

(+ Thnx if it helped you plz!)

 

[POQbum]

After testing different batteries I have sort of a mini stockpile going on, so I'll be using this to bump charge my phone. Before it was just too much of a hassile to bump charge but this makes it easy

 

[vassskk]

awesome, how many bumps do you normally do?

 

[jayochs]

sweeeet. but question; do these appliance timers tick like a timeR? haha that would drive me insane while sleeping

 

[vassskk]

sweeeet. but question; do these appliance timers tick like a timeR? haha that would drive me insane while sleeping

nope. it will tick once when it switched from off to on etc. There are also digital ones.

 

[UHF3]

Simple, ingenious and falls into that "Why didn't I think of that" category. Thanks for the tip.

 

[vassskk]

Just tried this last night, worked flawlessly; woke up @99% charge

 

[POQbum]

Just tried this last night, worked flawlessly; woke up @99% charge

Yep woke up to 97% here so still some tweaking to do, but better than the 92% I normally wake up to.

 

[jma5terj]

Simple, ingenious and falls into that "Why didn't I think of that" category. Thanks for the tip.

Yes it does. Thanks for the idea!

 

[vassskk]

i greatly appreciate mashing of the thnx button

 

[pharpe]

I thought that bump charging was bad for the battery. Is the slight increase in initial charge worth degrading the life of the battery? Any insight on how bad this actually is for the batter?

 

[POQbum]

I thought that bump charging was bad for the battery. Is the slight increase in initial charge worth degrading the life of the battery? Any insight on how bad this actually is for the batter?

Bump charging while the phone is fully turned on has almost no affect because it doesn't truly bump charge- you're just keeping it at 100% instead of having your phone drain it down to ~90% and keeping it there. If you want to go over 100% you have to turn off Android (phone) and purely charge the battery, then if you unplug and do it again that's real bump charging.

If done regularly (with phone turned off) it can and will damage your battery degrading the overall lifespan. The benefit is you can end up with 105-115% normal battery capacity where when you turn on your phone, it will stay at 100% for hours.

But yea when I said bump charging before I meant with the phone on :s

 

[vassskk]

This walkthrough assumes you have read the linked article. Definitely turn your phone off first if you are planning on doing the bumpcharge method.

Sent from my ADR6300 using XDA App

 

[wkupike2000]

Question for the expert

This walkthrough assumes you have read the linked article. Definitely turn your phone off first if you are planning on doing the bumpcharge method.

Sent from my ADR6300 using XDA App

Love the linked article and this walk through. My questions are do these timers(or the one you linked on Amazon) allow for multiple settings (like 4 different on/off times) or just one time for on and one time for off?

And I'm assuming the initial method is with your phone left on, bump charge with phone turned off? Since you are definitely the expert, which method do you prefer and why?

 

[POQbum]

Love the linked article and this walk through. My questions are do these timers(or the one you linked on Amazon) allow for multiple settings (like 4 different on/off times) or just one time for on and one time for off?

And I'm assuming the initial method is with your phone left on, bump charge with phone turned off? Since you are definitely the expert, which method do you prefer and why?

Almost all timers you can set an on/off time for half-hour increments- the digital ones you can probably be more specific.

Mine I set off/on 3 times right before I wake up.

Bump charging with your phone on will just keep your battery at 100%, since android by default keeps it around 90% if plugged in constantly (keeping a battery fully charged for extended periods of time is potentially damaging/ also reports of cheap batteries that are overcharged or on the charger too long exploding)

Bump charging with your phone off will overcharge your battery, this will cause some battery cells to die and lessen the amount of charge your battery can hold the next time you charge it. If you continue to do this then after 2-4+ months of bump charging, you may end up with a battery that will only bump charge as much as a normal charge used to be. This would be where you either buy a new battery or live with that fact.

 

[vassskk]

+1
Byrong calls bumpchargers 'power users' that will 'buy new batteries every few months.' So it really doesnt matter that your trashing your battery if you perceive the temporary life gain to outweigh the loss of longevity.

Most timers have "multiple events." You just set them using little plastic pins so it really doesn't cost them anything to give you a bunch of pins.

I personally leave my phone on, as it is my 2nd alarm clock. I have my inital off set to 2am (about 30 mins after my usual sleep time) to bring the battery up to the optimal 40% charge it should sit at. My on is set to 6am, 2 hours before i normally wake up. I do not bump, as i am not baller' $$$$$.

 

[SynisterWolf]

This walkthrough assumes you have read the linked article. Definitely turn your phone off first if you are planning on doing the bumpcharge method.

Sent from my ADR6300 using XDA App

i thought if you charge you phone when its "off" you dont need to bump charge. I always charge mine at night and i will turn it on in the morning after boot i get 99% 2 min later after everything is done loading it still at 99% and i can get a whole day out of it. (stock battery) or if i run pandora for 11 hours (work 8 hours and commute 1.5 hours each way.) i will end up with 13%

 

[GInfield]

Cool, Going to try tonight.

 

[POQbum]

i thought if you charge you phone when its "off" you dont need to bump charge. I always charge mine at night and i will turn it on in the morning after boot i get 99% 2 min later after everything is done loading it still at 99% and i can get a whole day out of it. (stock battery) or if i run pandora for 11 hours (work 8 hours and commute 1.5 hours each way.) i will end up with 13%

Well ya, charging your phone regularly with it off will get you 100%, but people like bump charging because you can overcharge the battery to 105-120%

Unless.. what you're saying is I don't need to 'bump charge' with my phone on when I can just normal charge with it off? And to that I say neh! I use mine as my main alarm clock and would like to be woken up if someone calls or texts me (most of the time anyway..)

For some or maybe even most people turning off your phone and charging might be the better choice.

 

[vassskk]

I believe that even charging your phone with it off, will still allow it to creep down to 90% though yea? Those protect circuits are physically part of the battery.

Heres one:
http://datasheet.sii-ic.com/en/battery_protection/S8200A_E.pdf